Signs Your Water Heater Is Failing

Rusty or Discolored Hot Water

If your hot water runs rusty or brown while the cold water stays clear, the inside of the tank is likely corroding. This is one of the clearest signs that a tank is near the end of its life. Once the inner lining fails, replacement is the only real fix.

Rumbling, Popping, or Knocking Sounds

Rumbling and popping usually means a thick layer of sediment has built up on the bottom of the tank. As water boils beneath the sediment, it makes that telltale noise. Sediment reduces efficiency and overheats the tank bottom, which accelerates failure. A flush sometimes helps early on, but if the sediment has hardened, the damage is often already done.

Lukewarm or Running Out of Hot Water

If showers turn cold faster than they used to, or the water never gets fully hot, the heating element, burner, or thermostat may be failing. On an electric unit, one of two elements is often out. On a gas unit, it could be a failing gas valve or a clogged burner. Some of these are repairable — but on an older tank, it is often the first sign of a downward slide.

Water Pooling Around the Base

This is the one you should never ignore. Water around the base of the tank often means the tank itself has corroded through, and the next failure could be a full rupture. Shut off the water supply and the power or gas, then call us immediately. A burst tank can dump dozens of gallons of water in minutes.

Age Beyond 10 Years

Even without symptoms, a standard tank past 10 to 12 years old is living on borrowed time — and Palo Alto's hard water pushes many units toward the low end of that range. If your tank is in that window and you are already seeing one or two of the signs above, plan the replacement now while you can shop on your schedule.

Plan Ahead Instead of Scrambling

The worst time to replace a water heater is at 6 a.m. on a cold morning when the old one has already failed. If you notice any of these signs, get ahead of it. A quick inspection tells you whether you have months left or should replace it soon.

Call 650-555-5555 and we will diagnose your water heater and give you an honest timeline — so the next failure is a planned one, not an emergency.